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C8051F300 Datasheet(PDF) 39 Page - List of Unclassifed Manufacturers |
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C8051F300 Datasheet(HTML) 39 Page - List of Unclassifed Manufacturers |
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39 / 174 page  C8051F300/1/2/3/4/5 Rev. 2.6 39 5.3.3. Settling Time Requirements When the ADC0 input configuration is changed (i.e., a different AMUX0 or PGA selection is made), a mini- mum tracking time is required before an accurate conversion can be performed. This tracking time is deter- mined by the AMUX0 resistance, the ADC0 sampling capacitance, any external source resistance, and the accuracy required for the conversion. Note that in low-power tracking mode, three SAR clocks are used for tracking at the start of every conversion. For most applications, these three SAR clocks will meet the mini- mum tracking time requirements. Figure 5.5 shows the equivalent ADC0 input circuits for both Differential and Single-ended modes. Notice that the equivalent time constant for both input circuits is the same. The required ADC0 settling time for a given settling accuracy (SA) may be approximated by Equation 5.1. When measuring the Temperature Sensor output or VDD with respect to GND, RTOTAL reduces to RMUX. See Table 5.1 for ADC0 minimum settling time (track/hold time) requirements. Equation 5.1. ADC0 Settling Time Requirements Where: SA is the settling accuracy, given as a fraction of an LSB (for example, 0.25 to settle within 1/4 LSB) t is the required settling time in seconds RTOTAL is the sum of the AMUX0 resistance and any external source resistance. n is the ADC resolution in bits (8). Figure 5.5. ADC0 Equivalent Input Circuits t 2 n SA ------- R TOTALCSAMPLE × ln = R MUX = 5k RC Input= RMUX * CSAMPLE R MUX = 5k C SAMPLE = 5pF C SAMPLE = 5pF MUX Select MUX Select Differential Mode P0.x P0.y R MUX = 5k C SAMPLE = 5pF RC Input= RMUX * CSAMPLE MUX Select Single-Ended Mode P0.x Note: When the PGA gain is set to 0.5, C SAMPLE = 3pF |
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